JP2000501998A - Surface measurement and automatic milling in spinneret manufacturing. - Google Patents

Abstract

(57) [Summary] After drilling holes in the spinneret and before broaching, the surface of the coining spinneret is milled using a numerically controlled milling machine. Attach the probe to the milling machine to obtain data points on the uneven surface of the coining spinneret. A low point in a predetermined area of a projection on the uneven surface of the coining spinneret is detected. For example, if the hole in the finished spinneret is annular, splines connecting the low points in the concentric rings are used to depict the finished surface. The spiral tool path is obtained using a depiction of the finished surface and generates a G code to control the milling machine to move the tool along the tool path. The coining spinneret is milled and then subjected to general finishing, including broaching.

Description

DETAILED DESCRIPTION OF THE INVENTION Surface measurement and automatic milling in spinneret manufacturing. Background of the Invention   The present invention relates to the production of filaments from synthetic polymers, and more particularly, to the production thereof. The present invention relates to the production of a spinneret plate for spinning a filament therethrough. Explanation of related technologies   For the production of synthetic fibers, a polymer, i.e., a molten polymer or In "solvent" or "dry" spinning, the polymer solution is Extruding through small holes. This hole is typical for solvent spinning. Typically, it is 30 to 70 μm at the widest part of the hole. Increase the viscosity of the polymer solution and Due to the need to obtain the highest possible production speed, the spinneret is relatively thick Must-have. At the same time, to produce the highest quality fibers possible, The internal shape and dimensions of all the holes in the spinneret should be as little as possible Is desirable. Each spinneret partially changes other conditions in the fiber manufacturing process Can be used to produce the widest possible range of fiber sizes Is also preferred. Because of the size of such a spinneret, it is typically 4-8 cm in diameter. And the thickness is 1-2 mm. Hundreds of precisely shaped holes using conventional technology Is difficult to obtain.   Conventional spinneret fabrication methods are well known. Spinneret (also called jet) Examples of the manufacturing method are described in U.S. Patent Nos. 3,362,265, 3,338,085 and 3,338,085. No. 2,730,175. USA As disclosed in patent 3,362,265, coined or coined. One or more drillings resulting in what is called a coined spinneret The steps are typically performed. A coining spinneret typically includes a punch. The opposite side of the spinneret contains 40 to 600 protuberances. These protrusions are ground away and then the final shape of the capillary part of the hole is changed to a broach (br oach). Allows the broach to be centered accurately in the hole Is preferably not drilled in the grinding process, and Using the remaining marks, the broach can be centered. Conventional drilling The machine should prevent broaching of holes during the initial drilling process (es) Can be. However, the coining spin on the side opposite to the surface on which the drilling machine operates The resulting “bumpy” surface of the thread cap shall be drilled Deformed by the construction process, on a very small scale, for example, 0.025 mm to 0.100 mm A change at the base of the protrusion within the area creates a relatively uneven surface. As a result, Grinding the coining spinneret to obtain a constant thickness of metal at the bottom of the pit Have difficulty.   Conventionally, metal protrusions are manually ground using a belt grinder. No spinneret Extremely dexterity, experience and patience are required to manually grind a uniform surface It is. This process is, roughly speaking, grinding, visual inspection, turning over the spinneret and It can be described as repetition. All during this grinding the metal gets hotter Become. Experienced workers can find a large number of holes, for example 500 holes, within 45 minutes to 1 hour. Can be ground. Partially formed spinneret Despite the heating and other stresses involved in this process, experienced personnel must A tolerance of ± 25 μm in the residual thickness of the metal at the bottom of the recess can be maintained. Spinneret Match in gold hole size To improve performance, it is desirable to reduce this variation. This process is automatic Previous attempts to achieve no significant reduction in metal thickness variations. Disclosure of the invention   An object of the present invention is to provide a spinneret capable of producing high-quality synthetic fibers. Is Rukoto.   Another object of the present invention is to provide a spinning fiber capable of producing fibers having different properties. Is to provide a base.   It is also an object of the present invention to have dimensions of capillary transition length variation as small as ± 15 μm. The object is to provide a spinneret provided with holes.   The above purpose is to detect a plurality of low points on the surface of the surface of the coining spinneret where the protrusion is located. The finished surface of the coining spinneret is drawn by interpolating between the low points (repr esentation), pressure application based on the finish surface of the coining spinneret Milling the surface of the spinneret with protrusions and the stamping spinneret This is achieved by providing a method of making a spinneret that includes a raising step.   A conventional punching process is applied to the spinneret blank to produce a coining spinneret. . The optical probe is then coined, preferably by a milling machine. Move over the entire surface with the gold protrusion to detect the coordinates of the surface with the spinneret protrusion. You. Next, find a plurality of low points within a predetermined area of the surface where the protrusions are. This predetermined area is the pattern of the protrusions on the surface where the protrusions of the coining spinneret are located. Selected based on the For example, having protrusions in a pattern of a plurality of concentric rings The predetermined area for the spinneret is larger than the corresponding projection ring. A plurality of small circular areas arranged in a ring having a slightly larger radius; Can be the smallest radius One area inside the projection ring having the largest radius and the one area inside the projection ring having the largest radius. The other region outside the ring of the contacted region exists as an extra ring region.   The lowest point of each predetermined area is preferably for 3D curve fitting To create splines that characterize the desired finished surface. With concentric rings The splines are preferably substantially concentric (e.g., completely Although not flat). For finishing surface drawing, milling finish surface of coining spinneret A general computer that can also create commands for milling machines to cut Can be obtained from the splines using a data usage manufacturing program.   The same milling machine used to detect the surface of the coining spinneret is preferred After the tool or tool has been installed in place of the optical probe, the finish surface of the coining spinneret Used to execute the commands resulting from the depiction of Then, the spinneret Broach the remaining metal at the bottom of each well, and Finished by performing any other common operation.   The above objectives, together with other objectives, and the advantages which will become apparent hereinafter, are set forth in part below. The accompanying drawings that form (similar numbers in the drawings indicate similar parts throughout). Reference is made to the detailed arrangements and operations that are more fully described and claimed. I do. BRIEF DESCRIPTION OF THE FIGURES   In the following description of the preferred embodiments, reference is made to the accompanying drawings.   FIG. 1 shows a mounting supporting a coining spinneret for surface detection and milling. It is a fragmentary sectional view of an ingredient.   FIG. 2 is a block diagram of an apparatus for manufacturing a spinneret according to the present invention.   3, 4, 5 and 7 are flowcharts of the method according to the present invention.   FIG. 6 is a perspective view of a spline used to depict the finished surface of a spinneret. You. Description of the preferred embodiment   The spinneret is manufactured by flattening by a common method, such as die punching. Start with a spinneret blank shaped in the form of a thimble. Figure shows an example of spinneret 10 1 is shown in cross section. 1 will be described later. As previously mentioned, conventional drilling The indentation process (group) is carried out, and the indentation (inde ntations). This results in a protrusion on the "upper" surface of the spinneret 10. berances) are created. Each of these surfaces is a recess in the coining spinneret It will be referred to as the forming surface and the surface with the protrusions.   According to a preferred embodiment, the projections on the surface of the coining spinneret where the projections are located are Fada l Solutions such as Fadal VMC 40 from Engineering, Chatsworth, California Rice or similar computer numerical control (CNC) and preferably direct numerical control (DN C) Mill using a milling machine. Stamping during the milling process The coining spinneret 10 is preferably of the type shown in FIG. Is attached to the fixture 11 as shown in FIG. The fixture 11 shown in FIG. It has a base 12 for a spinneret having a total diameter of mm. 50mm spinning shown in Figure 1 An adapter 14 can be provided for other sizes of spinnerets, such as the spinneret 10. it can. Various overall changes in the shape of coining spinnerets of the same size but Cause a difference Interchangeable to get a tight fit for spinnerets with lost patterns Use a simple block 16. Slight crown or ridge on top of replaceable block 16 Preferably, there is an evoked center. Spinneret 10 is on top of replaceable block 16 And fixed in place by a ring 18. In a preferred embodiment, this Is achieved by an air finger 20 mounted on the base 12. The movement of the ring 18 is stopped, for example, by bolts 22 (one of which is shown in FIG. 1). ing.   The spinneret 10 is fixed in place by a ring 18 so that it can be replaced. The raised crown of the lock 16 slightly deforms the spinneret, and the hole forming process ( No depressions are created as a result of the group), all parts of the depression forming surface can be replaced The block 16 is brought into contact. As a result, the spinneret 10 during the next milling process Pressure does not cause the spinneret 10 to deform.   The apparatus shown in FIG. 2 performs the steps of FIGS. Used for milling and removing protrusions. First, as shown in step 28 of FIG. Thus, the coining spinneret 10 is fixed at a predetermined position. Probe 30, preferably UBM Corporation, Roselle with 1 μm spots at a working distance of ± 300 μm , UBM TelefocusSen from New Jersey sor), mount a laser probe like part number 1083 on top 31 of milling machine 32 I do. Any spinning of the same size, regardless of the pattern of the protrusions on the laser probe This is preferred because a simple spiral pattern can be used for the base. machine When using a type probe, the probe movement pattern is determined by the hole pattern of the spinneret. The probe is stored on the surface with the protrusion of the coining spinneret. Contact within the "valleys" between the projections.   In a preferred embodiment, a data processing system 34 for a milling machine 32 or other The program storage system moves the probe 30 over the spinnerets of different sizes. Stores a program for running 37. Detected by probe 30 The coordinates are transferred to a data processing system 34 by a data collector 36. De The data collector 36 stores the data as it occurs 38 and then continues Any common device that transfers files to data processor 34 Alternatively, data collector 36 may directly connect probe 30 to data processing system 34. It may be an interface for direct connection.   As indicated by the dashed line connecting the data collector 36 and the milling machine 32, The x, y and z coordinates of lobe 30 are typically provided by milling machine 32, while The distance from the mount for the probe 30 to the surface of the spinneret 10 Is supplied. From the milling machine during the detection process and the subsequent milling process The accuracy of the coordinate data is very important. Therefore, Mitatoyo, paramus, Part number AT21C-529-567 or Heidenhain manufactured by New Jersey  Model Number LS704C manufactured by Corporation, Schaumburg, Illinois Such as Load mounted encoder (not shown separately), especially glass A glass scale encoder is preferably used. Data collector 36 Does not store the data obtained from probe 30, but simply processes this data. Position information provided by the encoder, Data processing system 34 on the solid line connecting the data processing system 34 and the milling machine 32. As shown by the dashed arrow also feeds directly into the data processing system 34 can do.   Fadal VMC 40 moves the tool 39 or probe 30 A numerically controlled motor to power the Typical of DNC and CNC milling machines in that they include means for mounting with rollers. is there. However, most milling machines available in the United States of comparable size Unlike the Fadal VMC 40, which is very desirable when working on small It can be purchased with a load mount encoder as a reserve. In the description below When referring to the milling machine 32 as shown in FIG. Controller and load mount encoder, which can be obtained separately from the milling machine Including   In the remainder of the invention, the diameter is between 50 and 100 mm and the center of the spinneret An example of a spinneret with holes to be formed between 6 mm and 48 mm is used. This spinning The base is machined to form approximately 500 holes. Made by the present invention As with all spinnerets that are used, this spinneret is preferably a stamped spinneret. Centering notch or other general purpose to precisely align 10 with fixture 11 Indicators are included. In this embodiment, the laser probe 30 has protrusions. A starting radius of 6 mm and 48 mm to completely cover the area of the spinneret in which it is located. It moves in a spiral path with a terminal radius of mm. Using the above equipment, spinneret Coordinates for about 75,000 points are created.   Reduce the amount of processing performed by the data processing system 34 and In order to enable the proper milling of the yarn cap 10, The area in between is defined for each pattern of holes. For this purpose, the data set Is stored in the data processing system 34, and the coining process is performed for each pattern of each size. A predetermined area adjacent to the hole of the thread cap is defined. For example, each about 0.75 Hundreds of circular areas with a radius of mm were used for the spinneret example above Can be used for Data processing system 34 received from probe 30 Check all of the points and store the lowest point in each area for the next process.   The hole pattern of the coining spinneret 10 controls the hole making process (group) as before. It is defined by the program used to control Machine containing hole pattern data The readable file gets a predefined area where the low points are located To the data processing system. In the above spinneret example, 50 to 10 The 0 mm spinneret is slightly less than the 500 protrusions at this point during the manufacture of the spinneret. Will have no holes. The protrusions are, for example, a constant pitch between concentric circles of 2.5 mm Are arranged at equal intervals around and concentric with the concentric circles.   In order to obtain data defining a predetermined area, the hole pattern of the spinneret of the embodiment is used. An example of how turns can be used is shown in the flow chart in FIG. Shown in the chart. Enter or read the hole pattern (40), then The coordinates of the center of the area are determined (42). The hole pattern, as in the spinneret example When concentric or annular, the predetermined area is also preferably formed in an annular shape . Because the third (vertical) dimension is unknown, the second The dimensional coordinates are used. Therefore, the ring of the predetermined area is called a two-dimensional ring. Devour.   For a spinneret having a hole pattern with n rings, the number of two-dimensional rings is Preferably n + 2. Of these n + 2 rings, n is preferably Slightly larger than the corresponding ring of protrusion. For example, for these n two-dimensional rings, Each radius is three times the constant pitch of the projecting ring rather than the radius of the adjacent projecting ring. It can be as large as one-fold. A predetermined on each of these n rings The center of a closed region is equidistant from the two nearest protrusions in the adjacent annulus So, it is located. The additional two-dimensional ring is preferably, for example, the innermost projection. The radius of the innermost protrusion is about one third of the constant pitch smaller than the starting ring. Defined inside the ring (44). The final two-dimensional ring is preferably the closest two-dimensional Has a radius that is about two-thirds of the constant pitch of the projecting ring than the radius of the ring It is defined outside the circle of the outermost projection (44). The data that defines a two-dimensional ring is Is stored in the data processing system 34 (46).   Using the above predetermined pattern of regions typically obtained in advance, The data points obtained from the lobes 30 are around the center of each of the predetermined regions. Is scanned within a 0.75 mm radius. Search for the data point stored in step 46 of FIG. To do so, any method can be used. For example, in a predetermined area Use a real-time data capture program to store only Can be. The points received are based on previously stored values (up to very large values). The new value is smaller than the previously stored value Is stored only if it has a different vertical dimension. This method minimizes storage space Data, but as fast as data points are received from the probe. Data processing system 34 or data collector 36 capable of processing data Requires a processor. When not using a real-time data processing system Data processing system to store the data points when they are received. Use data collector 36 or memory (not separately shown) in system 34 Can be. This data can be processed later as shown in FIG.   The minimum value in each of the predetermined areas is determined by the protrusion of the coining spinneret 10. Construct a low point on a surface. In the above spinneret example And these points must be connected by a three-dimensional curve that approximates a circle in the xy plane. Can be. These curves represent the splines that define the desired finished surface of the spinneret. Constitute. A perspective view of the spline for a non-proportionate spinneret example is shown in FIG. Show. Use common curve fitting methods to build equations for splines Or between the low spots detected on the surface with the projections of the coining spinneret. Surfware to depict the finishing surface of a coining spinneret by interpolating  Incorporated, from SURFCAM from San Fernando, California Such commercially available programs can be used. This operation is performed by the block shown in FIG. Represented by 50. Surf cams also have a three-dimensional spiral line to make the finishing surface Generate commands to control milling machine 32 to move across the road be able to. First, a general tool path is created52, then in a later step A special G code for the controller of board 32 is generated (54). G Co Using surf cams as an example of how For other common 3D milling professionals like Smart Cam (SMARTCAM) Grams can also be used.   In order to mill the spinneret as in the above example, the There can be as many G code instructions. Milling machine controller data Milling machine 32 is preferably a direct numerical Control (DNC) is possible, so the G code is milled from the data processing system 34 It can be transferred directly to the board 32 controller (56).   Milling operations are performed on 0.5-inch carbide ball end mills, such as Sandvi Sandvik carbide end mills, such as part number R216.44-12030-AK26L MC45, Common tools 39 can be used . Machining with rough and finishing tools in the usual way, if necessary Can be performed. In the above example, all surface detection and fly The grinding process can be completed within about one hour. Milling is complete After that, general broaching and all other finishing steps are performed (58).   Many features and advantages of the invention will be apparent from the detailed description. Accordingly, the following claims fall within the true spirit and scope of the present invention. It is intended to cover all such features and advantages of the invention. Plus, countless The present invention has been illustrated and described, as modifications and variations of this will readily occur to those skilled in the art. It is not desired to limit the exact configuration and operation, and all appropriate modifications and Equivalents may be sought within the scope of the present invention.

────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Focus, Timothy Martin             United States, Tennessee 37663, Kin             Gusport, Coralwood Drive             408 (72) Inventor Grant, James Emmet Juni             A             United States, Tennessee 37601, Jo             Nson City, Mollard Street               504

Claims (1)

[Claims]   1. (A) detecting a plurality of low points on the surface of the surface of the coining spinneret where the protrusions are located;   (B) by interpolating between the low points detected by step (a) , A process of drawing on the finishing surface of the coining spinneret,   (C) Based on the depiction of the finished surface of the coining prevention die generated in step (b), Milling the surface of the stamping spinneret with projections; and   (D) Step of finishing the coining spinneret A method for producing a spinneret comprising:   2. The detection in step (a)   (A1) detecting the coordinates of a point on the surface where the protrusion of the coining spinneret is located;   (A2) defining a predetermined area adjacent to the plurality of holes of the coining spinneret; The process of obtaining data   (A3) A coining spinneret in a predetermined area defined in the step (a2). Determining each of a plurality of low points on a surface having protrusions The method of claim 1 comprising:   3. The detection in step (a1)   (A1A) Attach the coining spinneret to the milling machine provided with the surface probe Process,   (A1B) The surface of the coining spinneret moves so as to move over the surface on which the protrusion is located. Controlling the movement of the probe; and   (A1C) The relative position of the probe during the movement of the probe in step (a1B) The process of recording the mark 3. The method according to claim 2, comprising:   4. The surface with the projections of the coining spinneret has a center, and the method comprises: A step of preparing a milling machine having a probe, the step (a1B). Is controlled by a spiral that almost departs from the center of the projection surface of the coining spinneret. 4. The method according to claim 3, wherein the movement of the biological probe is controlled.   5. (E) Stamping the metal blank to form a concentric ring of protrusions on the surface with protrusions Correspondingly, having a ring of indentations on the indentation surface opposite the surface on which the protrusions are Further comprising the step of forming a coining spinneret, wherein the step (a2) 3. The method according to claim 2, wherein the specified data defines a two-dimensional ring of a predetermined area. The method described.   6. The definition in the step (a2) is that a two-dimensional circle between each of the concentric rings of the protrusions Ring, two-dimensional ring inside projection innermost ring and projection outermost ring outside 6. A method according to claim 5, wherein one of the two outermost two-dimensional toruses is defined. .   7. The determination in the step (a3) is performed when each predetermined area of the two-dimensional torus is determined. Compare the three-dimensional coordinates of points within each of the areas with one-dimensional and two-dimensional coordinates. Finding the lowest point in each of the predetermined regions, and The representation in (b) is determined in step (a3) using (b1) 3D curve fitting 6. The method according to claim 5, comprising the step of connecting the obtained low points.   8. The connection in step (b1) creates a concentric spline, and (B2) further interpolates between concentric splines to render the finished surface Milling in step (c) comprising:   (C1) A process for defining a three-dimensional spiral path for a tool based on the representation of the finished surface And   (C2) moving the tool along the three-dimensional spiral path defined in step (c2) Process The method of claim 7 comprising:   9. The coining in the step (e) is performed around the concentric circles at a constant pitch between the concentric circles. To form equally spaced projections, centered on concentric circles, According to the data obtained in the step (a2), a predetermined area can be set to two adjacent circles. Substantially equidistant from the nearest protrusion and more constant than the radius of the adjacent circle Outer circle having a radius about one third of the pitch of the outer circle, larger than the radius of the adjacent circle Also, an inner circle having a radius approximately one-third smaller than a constant pitch and a predetermined radius Half of the constant pitch, approximately two-thirds larger than the radius of the closest circle 9. The method according to claim 8, wherein the center is located along one of the outermost circles having a diameter. the method of.   Ten. The occurrence in step (b) is   (B1) connecting the low points detected in step (a) using three-dimensional curve fitting, The process of making splines;   (B2) interpolating between splines to depict the finished surface; Milling in step (c)   (C1) defining a three-dimensional spiral path of the tool based on the representation of the finished surface;   (C2) moving the tool along the three-dimensional spiral path defined in step (c2) Process 3. The method according to claim 2, comprising:   11． Means for detecting low points on the surface of the coining spinneret where the protrusions are located; By interpolating between the detected low points, the finish surface of the coining spinneret is drawn. Means for indicating; based on the finish surface of the coining spinneret depicted in step (b) Stamping process spinneret protrusion Equipped with means for milling a certain surface and for finishing the coining spinneret A spinneret manufacturing device.   12． Selectively mount the probe and tool, and stamp either the probe or the tool. The probe is moved over the surface with the protrusion of the processing spinneret and the probe Milling machine adapted to detect the coordinates of the surface with protrusions; coining spinneret Restricts probe movement along the first path, which substantially covers the surface with gold bumps Controlling a controller coupled to the milling machine; and the milling machine, the controller Controller on the surface with the projections of the coining spinneret. The low point between the coordinates in the defined area is detected, and the stamping Draws the finished surface of the spinneret and based on the finished surface of the coined spinneret Command for the controller to move the tool along the second path Of coining spinneret with data processing system programmed Surface smoothing device with raised surface.   13. The data processing system fits the three-dimensional curve to a low point and uses the three-dimensional curve. Claim 11 programmed to depict the finished surface On-board equipment.   14. The surface of the coining spinneret with the protrusions has a predetermined pattern of protrusions. A concentric ring, and the data processing system reserves a predetermined area Adjacent to at least one side of each of the concentric rings of protrusions in a defined pattern Claim 12 which is programmed to be arranged in a two-dimensional ring On-board equipment.   15． Pre-defined of concentric rings of protrusions on the surface with protrusions of coining spinneret The pattern uses a constant pitch to leave space between concentric rings, and , The data processing system places each of the predetermined areas in a neighborhood having a radius. The two closest neighbors of the ring Pitches that are substantially equidistant from the projections and are larger than the radius of the adjacent ring. Outer circle with a radius approximately one-third larger than the radius of the adjacent An inner circle having a radius approximately one-third smaller than the constant pitch and a predetermined area Has a radius approximately two-thirds larger than the radius of the circle closest to the area Claims that are programmed to be placed along one of the outermost circles Item 14. The apparatus according to Item 13.